IDL: Make enums have global visibility

Source/modules/indexeddb/IDBDatabase.idl

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple Inc. All rights reserved.
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 // https://dvcs.w3.org/hg/IndexedDB/raw-file/default/Overview.html#idl-def-IDBDatabase
 
-// FIXME: de-duplicate this when crbug.com/390758 is fixed.
-enum IDBTransactionMode {
-    "readonly",
-    "readwrite",
-    "versionchange"
-};
-
 [
     ActiveDOMObject,
     GarbageCollected,
 ] interface IDBDatabase : EventTarget {
     readonly attribute DOMString name;
     // DOMString version is non-standard, to support databases created with old API.
     readonly attribute (unsigned long long or DOMString) version;
     readonly attribute DOMStringList objectStoreNames;
     [RaisesException] IDBObjectStore createObjectStore(DOMString name, optional IDBObjectStoreParameters options);
     [RaisesException] void deleteObjectStore(DOMString name);
     [CallWith=ScriptState, RaisesException] IDBTransaction transaction((DOMString or sequence<DOMString> or DOMStringList) storeNames, optional IDBTransactionMode mode = "readonly");
     void close();
     attribute EventHandler onabort;
     attribute EventHandler onclose;
     attribute EventHandler onerror;
     attribute EventHandler onversionchange;
 };